<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
    <title>Title</title>
    <script src="../jquery/jquery-3.2.1.min.js"></script>
    <script src="../js/bootstrap.min.js"></script>
    <link rel="stylesheet" href="../css/bootstrap.css">
</head>
<body style="height: 1200px;">

<!-- navbar-fixed-top 锁住导航-->

<nav class="navbar navbar-inverse navbar-fixed-top">

    <div class="nav navbar-header">

        <img src="../img/1.png" class="navbar-brand">

    </div>
    <ul class="nav navbar-nav">
        <li><a href="#">首页</a></li>
        <li><a href="#">关于我们</a></li>
        <li><a href="#">留言板</a></li>
    </ul>
    <form role="search" class="navbar-form navbar-left">
        <div class="form-group">
            <input type="text" class="form-control" placeholder="请输入...">
            <button type="button" class="btn btn-primary">搜索</button>
        </div>
    </form>
    <div class="container">
        <div class="nav navbar-nav navbar-right">
            <li><a href="#">首页</a></li>
            <li><a href="#">关于我们</a></li>
            <li><a href="#">留言板</a></li>
        </div>
    </div>

</nav>
<!-- 面包屑导航-->
<div class="container" style="margin-top: 50px;">
    <ul class="breadcrumb">
        <li><a href="#">首页</a></li>
        <li><a href="#">关于我们</a></li>
        <li><a href="#">留言板</a></li>
    </ul>
</div>

</body>
</html>